drivers/block/paride/bpck.c

   1 /*
   2         bpck.c  (c) 1996-8  Grant R. Guenther <grant@torque.net>
   3                             Under the terms of the GNU General Public License.
   4
   5         bpck.c is a low-level protocol driver for the MicroSolutions
   6         "backpack" parallel port IDE adapter.
   7
   8 */
   9
  10 /* Changes:
  11
  12         1.01    GRG 1998.05.05 init_proto, release_proto, pi->delay
  13         1.02    GRG 1998.08.15 default pi->delay returned to 4
  14
  15 */
  16
  17 #define BPCK_VERSION    "1.02"
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/kernel.h>
  23 #include <linux/types.h>
  24 #include <linux/wait.h>
  25 #include <asm/io.h>
  26
  27 #include "paride.h"
  28
  29 #undef r2
  30 #undef w2
  31
  32 #define PC                      pi->private
  33 #define r2()                    (PC=(in_p(2) & 0xff))
  34 #define w2(byte)                {out_p(2,byte); PC = byte;}
  35 #define t2(pat)                 {PC ^= pat; out_p(2,PC);}
  36 #define e2()                    {PC &= 0xfe; out_p(2,PC);}
  37 #define o2()                    {PC |= 1; out_p(2,PC);}
  38
  39 #define j44(l,h)     (((l>>3)&0x7)|((l>>4)&0x8)|((h<<1)&0x70)|(h&0x80))
  40
  41 /* cont = 0 - access the IDE register file
  42    cont = 1 - access the IDE command set
  43    cont = 2 - use internal bpck register addressing
  44 */
  45
  46 static int  cont_map[3] = { 0x40, 0x48, 0 };
  47
  48 static int bpck_read_regr( PIA *pi, int cont, int regr )
  49
  50 {       int r, l, h;
  51
  52         r = regr + cont_map[cont];
  53
  54         switch (pi->mode) {
  55
  56         case 0: w0(r & 0xf); w0(r); t2(2); t2(4);
  57                 l = r1();
  58                 t2(4);
  59                 h = r1();
  60                 return j44(l,h);
  61
  62         case 1: w0(r & 0xf); w0(r); t2(2);
  63                 e2(); t2(0x20);
  64                 t2(4); h = r0();
  65                 t2(1); t2(0x20);
  66                 return h;
  67
  68         case 2:
  69         case 3:
  70         case 4: w0(r); w2(9); w2(0); w2(0x20);
  71                 h = r4();
  72                 w2(0);
  73                 return h;
  74
  75         }
  76         return -1;
  77 }
  78
  79 static void bpck_write_regr( PIA *pi, int cont, int regr, int val )
  80
  81 {       int     r;
  82
  83         r = regr + cont_map[cont];
  84
  85         switch (pi->mode) {
  86
  87         case 0:
  88         case 1: w0(r);
  89                 t2(2);
  90                 w0(val);
  91                 o2(); t2(4); t2(1);
  92                 break;
  93
  94         case 2:
  95         case 3:
  96         case 4: w0(r); w2(9); w2(0);
  97                 w0(val); w2(1); w2(3); w2(0);
  98                 break;
  99
 100         }
 101 }
 102
 103 /* These macros access the bpck registers in native addressing */
 104
 105 #define WR(r,v)         bpck_write_regr(pi,2,r,v)
 106 #define RR(r)           (bpck_read_regr(pi,2,r))
 107
 108 static void bpck_write_block( PIA *pi, char * buf, int count )
 109
 110 {       int i;
 111
 112         switch (pi->mode) {
 113
 114         case 0: WR(4,0x40);
 115                 w0(0x40); t2(2); t2(1);
 116                 for (i=0;i<count;i++) { w0(buf[i]); t2(4); }
 117                 WR(4,0);
 118                 break;
 119
 120         case 1: WR(4,0x50);
 121                 w0(0x40); t2(2); t2(1);
 122                 for (i=0;i<count;i++) { w0(buf[i]); t2(4); }
 123                 WR(4,0x10);
 124                 break;
 125
 126         case 2: WR(4,0x48);
 127                 w0(0x40); w2(9); w2(0); w2(1);
 128                 for (i=0;i<count;i++) w4(buf[i]);
 129                 w2(0);
 130                 WR(4,8);
 131                 break;
 132
 133         case 3: WR(4,0x48);
 134                 w0(0x40); w2(9); w2(0); w2(1);
 135                 for (i=0;i<count/2;i++) w4w(((u16 *)buf)[i]);
 136                 w2(0);
 137                 WR(4,8);
 138                 break;
 139
 140         case 4: WR(4,0x48);
 141                 w0(0x40); w2(9); w2(0); w2(1);
 142                 for (i=0;i<count/4;i++) w4l(((u32 *)buf)[i]);
 143                 w2(0);
 144                 WR(4,8);
 145                 break;
 146         }
 147 }
 148
 149 static void bpck_read_block( PIA *pi, char * buf, int count )
 150
 151 {       int i, l, h;
 152
 153         switch (pi->mode) {
 154
 155         case 0: WR(4,0x40);
 156                 w0(0x40); t2(2);
 157                 for (i=0;i<count;i++) {
 158                     t2(4); l = r1();
 159                     t2(4); h = r1();
 160                     buf[i] = j44(l,h);
 161                 }
 162                 WR(4,0);
 163                 break;
 164
 165         case 1: WR(4,0x50);
 166                 w0(0x40); t2(2); t2(0x20);
 167                 for(i=0;i<count;i++) { t2(4); buf[i] = r0(); }
 168                 t2(1); t2(0x20);
 169                 WR(4,0x10);
 170                 break;
 171
 172         case 2: WR(4,0x48);
 173                 w0(0x40); w2(9); w2(0); w2(0x20);
 174                 for (i=0;i<count;i++) buf[i] = r4();
 175                 w2(0);
 176                 WR(4,8);
 177                 break;
 178
 179         case 3: WR(4,0x48);
 180                 w0(0x40); w2(9); w2(0); w2(0x20);
 181                 for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
 182                 w2(0);
 183                 WR(4,8);
 184                 break;
 185
 186         case 4: WR(4,0x48);
 187                 w0(0x40); w2(9); w2(0); w2(0x20);
 188                 for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l();
 189                 w2(0);
 190                 WR(4,8);
 191                 break;
 192
 193         }
 194 }
 195
 196 static int bpck_probe_unit ( PIA *pi )
 197
 198 {       int o1, o0, f7, id;
 199         int t, s;
 200
 201         id = pi->unit;
 202         s = 0;
 203         w2(4); w2(0xe); r2(); t2(2);
 204         o1 = r1()&0xf8;
 205         o0 = r0();
 206         w0(255-id); w2(4); w0(id);
 207         t2(8); t2(8); t2(8);
 208         t2(2); t = r1()&0xf8;
 209         f7 = ((id % 8) == 7);
 210         if ((f7) || (t != o1)) { t2(2); s = r1()&0xf8; }
 211         if ((t == o1) && ((!f7) || (s == o1)))  {
 212                 w2(0x4c); w0(o0);
 213                 return 0;
 214         }
 215         t2(8); w0(0); t2(2); w2(0x4c); w0(o0);
 216         return 1;
 217 }
 218
 219 static void bpck_connect ( PIA *pi  )
 220
 221 {       pi->saved_r0 = r0();
 222         w0(0xff-pi->unit); w2(4); w0(pi->unit);
 223         t2(8); t2(8); t2(8);
 224         t2(2); t2(2);
 225
 226         switch (pi->mode) {
 227
 228         case 0: t2(8); WR(4,0);
 229                 break;
 230
 231         case 1: t2(8); WR(4,0x10);
 232                 break;
 233
 234         case 2:
 235         case 3:
 236         case 4: w2(0); WR(4,8);
 237                 break;
 238
 239         }
 240
 241         WR(5,8);
 242
 243         if (pi->devtype == PI_PCD) {
 244                 WR(0x46,0x10);          /* fiddle with ESS logic ??? */
 245                 WR(0x4c,0x38);
 246                 WR(0x4d,0x88);
 247                 WR(0x46,0xa0);
 248                 WR(0x41,0);
 249                 WR(0x4e,8);
 250                 }
 251 }
 252
 253 static void bpck_disconnect ( PIA *pi )
 254
 255 {       w0(0);
 256         if (pi->mode >= 2) { w2(9); w2(0); } else t2(2);
 257         w2(0x4c); w0(pi->saved_r0);
 258 }
 259
 260 static void bpck_force_spp ( PIA *pi )
 261
 262 /* This fakes the EPP protocol to turn off EPP ... */
 263
 264 {       pi->saved_r0 = r0();
 265         w0(0xff-pi->unit); w2(4); w0(pi->unit);
 266         t2(8); t2(8); t2(8);
 267         t2(2); t2(2);
 268
 269         w2(0);
 270         w0(4); w2(9); w2(0);
 271         w0(0); w2(1); w2(3); w2(0);
 272         w0(0); w2(9); w2(0);
 273         w2(0x4c); w0(pi->saved_r0);
 274 }
 275
 276 #define TEST_LEN  16
 277
 278 static int bpck_test_proto( PIA *pi, char * scratch, int verbose )
 279
 280 {       int i, e, l, h, om;
 281         char buf[TEST_LEN];
 282
 283         bpck_force_spp(pi);
 284
 285         switch (pi->mode) {
 286
 287         case 0: bpck_connect(pi);
 288                 WR(0x13,0x7f);
 289                 w0(0x13); t2(2);
 290                 for(i=0;i<TEST_LEN;i++) {
 291                     t2(4); l = r1();
 292                     t2(4); h = r1();
 293                     buf[i] = j44(l,h);
 294                 }
 295                 bpck_disconnect(pi);
 296                 break;
 297
 298         case 1: bpck_connect(pi);
 299                 WR(0x13,0x7f);
 300                 w0(0x13); t2(2); t2(0x20);
 301                 for(i=0;i<TEST_LEN;i++) { t2(4); buf[i] = r0(); }
 302                 t2(1); t2(0x20);
 303                 bpck_disconnect(pi);
 304                 break;
 305
 306         case 2:
 307         case 3:
 308         case 4: om = pi->mode;
 309                 pi->mode = 0;
 310                 bpck_connect(pi);
 311                 WR(7,3);
 312                 WR(4,8);
 313                 bpck_disconnect(pi);
 314
 315                 pi->mode = om;
 316                 bpck_connect(pi);
 317                 w0(0x13); w2(9); w2(1); w0(0); w2(3); w2(0); w2(0xe0);
 318
 319                 switch (pi->mode) {
 320                   case 2: for (i=0;i<TEST_LEN;i++) buf[i] = r4();
 321                           break;
 322                   case 3: for (i=0;i<TEST_LEN/2;i++) ((u16 *)buf)[i] = r4w();
 323                           break;
 324                   case 4: for (i=0;i<TEST_LEN/4;i++) ((u32 *)buf)[i] = r4l();
 325                           break;
 326                 }
 327
 328                 w2(0);
 329                 WR(7,0);
 330                 bpck_disconnect(pi);
 331
 332                 break;
 333
 334         }
 335
 336         if (verbose) {
 337             printk("%s: bpck: 0x%x unit %d mode %d: ",
 338                    pi->device,pi->port,pi->unit,pi->mode);
 339             for (i=0;i<TEST_LEN;i++) printk("%3d",buf[i]);
 340             printk("\n");
 341         }
 342
 343         e = 0;
 344         for (i=0;i<TEST_LEN;i++) if (buf[i] != (i+1)) e++;
 345         return e;
 346 }
 347
 348 static void bpck_read_eeprom ( PIA *pi, char * buf )
 349
 350 {       int i,j,k,n,p,v,f, om, od;
 351
 352         bpck_force_spp(pi);
 353
 354         om = pi->mode;  od = pi->delay;
 355         pi->mode = 0; pi->delay = 6;
 356
 357         bpck_connect(pi);
 358
 359         n = 0;
 360         WR(4,0);
 361         for (i=0;i<64;i++) {
 362             WR(6,8);
 363             WR(6,0xc);
 364             p = 0x100;
 365             for (k=0;k<9;k++) {
 366                 f = (((i + 0x180) & p) != 0) * 2;
 367                 WR(6,f+0xc);
 368                 WR(6,f+0xd);
 369                 WR(6,f+0xc);
 370                 p = (p >> 1);
 371             }
 372             for (j=0;j<2;j++) {
 373                 v = 0;
 374                 for (k=0;k<8;k++) {
 375                     WR(6,0xc);
 376                     WR(6,0xd);
 377                     WR(6,0xc);
 378                     f = RR(0);
 379                     v = 2*v + (f == 0x84);
 380                 }
 381                 buf[2*i+1-j] = v;
 382             }
 383         }
 384         WR(6,8);
 385         WR(6,0);
 386         WR(5,8);
 387
 388         bpck_disconnect(pi);
 389
 390         if (om >= 2) {
 391                 bpck_connect(pi);
 392                 WR(7,3);
 393                 WR(4,8);
 394                 bpck_disconnect(pi);
 395         }
 396
 397         pi->mode = om; pi->delay = od;
 398 }
 399
 400 static int bpck_test_port ( PIA *pi )   /* check for 8-bit port */
 401
 402 {       int     i, r, m;
 403
 404         w2(0x2c); i = r0(); w0(255-i); r = r0(); w0(i);
 405         m = -1;
 406         if (r == i) m = 2;
 407         if (r == (255-i)) m = 0;
 408
 409         w2(0xc); i = r0(); w0(255-i); r = r0(); w0(i);
 410         if (r != (255-i)) m = -1;
 411
 412         if (m == 0) { w2(6); w2(0xc); r = r0(); w0(0xaa); w0(r); w0(0xaa); }
 413         if (m == 2) { w2(0x26); w2(0xc); }
 414
 415         if (m == -1) return 0;
 416         return 5;
 417 }
 418
 419 static void bpck_log_adapter( PIA *pi, char * scratch, int verbose )
 420
 421 {       char    *mode_string[5] = { "4-bit","8-bit","EPP-8",
 422                                     "EPP-16","EPP-32" };
 423
 424 #ifdef DUMP_EEPROM
 425         int i;
 426 #endif
 427
 428         bpck_read_eeprom(pi,scratch);
 429
 430 #ifdef DUMP_EEPROM
 431         if (verbose) {
 432            for(i=0;i<128;i++)
 433                 if ((scratch[i] < ' ') || (scratch[i] > '~'))
 434                     scratch[i] = '.';
 435            printk("%s: bpck EEPROM: %64.64s\n",pi->device,scratch);
 436            printk("%s:              %64.64s\n",pi->device,&scratch[64]);
 437         }
 438 #endif
 439
 440         printk("%s: bpck %s, backpack %8.8s unit %d",
 441                 pi->device,BPCK_VERSION,&scratch[110],pi->unit);
 442         printk(" at 0x%x, mode %d (%s), delay %d\n",pi->port,
 443                 pi->mode,mode_string[pi->mode],pi->delay);
 444 }
 445
 446 static struct pi_protocol bpck = {
 447         .owner          = THIS_MODULE,
 448         .name           = "bpck",
 449         .max_mode       = 5,
 450         .epp_first      = 2,
 451         .default_delay  = 4,
 452         .max_units      = 255,
 453         .write_regr     = bpck_write_regr,
 454         .read_regr      = bpck_read_regr,
 455         .write_block    = bpck_write_block,
 456         .read_block     = bpck_read_block,
 457         .connect        = bpck_connect,
 458         .disconnect     = bpck_disconnect,
 459         .test_port      = bpck_test_port,
 460         .probe_unit     = bpck_probe_unit,
 461         .test_proto     = bpck_test_proto,
 462         .log_adapter    = bpck_log_adapter,
 463 };
 464
 465 static int __init bpck_init(void)
 466 {
 467         return paride_register(&bpck)-1;
 468 }
 469
 470 static void __exit bpck_exit(void)
 471 {
 472         paride_unregister(&bpck);
 473 }
 474
 475 MODULE_LICENSE("GPL");
 476 module_init(bpck_init)
 477 module_exit(bpck_exit)